Ultrafast time-resolved measurements of a novel organic multichromophore TNT sensing material

PHYS 340

Aditya Narayanan, adityann@umich.edu, Department of Macromolecular Science and Engineering, University of Michigan, 930 N.University Avenue, #4830, Ann Arbor, MI 48109 and T. Goodson III, tgoodson@umich.edu, Department of Chemistry, University of Michigan-Ann Arbor, 930 North University Avenue, Ann Arbor, MI 48109.
A novel unexplored route in fluorescence chemical sensing that utilizes the exceptional spectroscopic capabilities of non-linear optical methods is two-photon excited fluorescence. This approach utilizes infrared (IR) light for excitation of remote sensors. We demonstrate this method using a novel dendritic system which possesses both excellent fluorescence sensitivity to the presence of TNT with IR pulses of light and high two-photon absorption (TPA) response. The mechanism of this impressive effect is investigated by ultra-fast measurements of fluorescence upconversion and transient absorption spectroscopy.
 

PHYS Poster Session - Optical Probes of Dynamics in Complex Environments
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008